<?php

/**
 * @package dompdf
 * @link    http://www.dompdf.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @author  Fabien M�nager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: autoload.inc.php 448 2011-11-13 13:00:03Z fabien.menager $
 */

/**
 * DOMPDF autoload function
 *
 * If you have an existing autoload function, add a call to this function
 * from your existing __autoload() implementation.
 *
 * @param string $class
 */
function DOMPDF_autoload($class) {
    $filename = DOMPDF_INC_DIR . "/" . mb_strtolower($class) . ".cls.php";

    if (is_file($filename))
        require_once($filename);
}

// If SPL autoload functions are available (PHP >= 5.1.2)
if (function_exists("spl_autoload_register")) {
    $autoload = "DOMPDF_autoload";
    $funcs = spl_autoload_functions();

    // No functions currently in the stack. 
    if (!DOMPDF_AUTOLOAD_PREPEND || $funcs === false) {
        spl_autoload_register($autoload);
    }

    // If PHP >= 5.3 the $prepend argument is available
    else if (PHP_VERSION_ID >= 50300) {
        spl_autoload_register($autoload, true, true);
    } else {
        // Unregister existing autoloaders... 
        $compat = (PHP_VERSION_ID <= 50102 && PHP_VERSION_ID >= 50100);

        foreach ($funcs as $func) {
            if (is_array($func)) {
                // :TRICKY: There are some compatibility issues and some 
                // places where we need to error out 
                $reflector = new ReflectionMethod($func[0], $func[1]);
                if (!$reflector->isStatic()) {
                    throw new Exception('This function is not compatible with non-static object methods due to PHP Bug #44144.');
                }

                // Suprisingly, spl_autoload_register supports the 
                // Class::staticMethod callback format, although call_user_func doesn't 
                if ($compat)
                    $func = implode('::', $func);
            }

            spl_autoload_unregister($func);
        }

        // Register the new one, thus putting it at the front of the stack... 
        spl_autoload_register($autoload);

        // Now, go back and re-register all of our old ones. 
        foreach ($funcs as $func) {
            spl_autoload_register($func);
        }

        // Be polite and ensure that userland autoload gets retained
        if (function_exists("__autoload")) {
            spl_autoload_register("__autoload");
        }
    }
} else if (!function_exists("__autoload")) {

    /**
     * Default __autoload() function
     *
     * @param string $class
     */
    function __autoload($class) {
        DOMPDF_autoload($class);
    }

}
